<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2006 - 2012 EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 2.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * CodeIgniter Memcached Caching Class
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Core
 * @author		ExpressionEngine Dev Team
 * @link
 */

class CI_Cache_memcached extends CI_Driver {

    private $_memcached;	// Holds the memcached object

    protected $_memcache_conf 	= array(
        'default' => array(
            'default_host'		=> '127.0.0.1',
            'default_port'		=> 11211,
            'default_weight'	=> 1
        )
    );

    // ------------------------------------------------------------------------

    /**
     * Fetch from cache
     *
     * @param 	mixed		unique key id
     * @return 	mixed		data on success/false on failure
     */
    public function get($id)
    {
        $data = $this->_memcached->get($id);

        return (is_array($data)) ? $data[0] : FALSE;
    }

    // ------------------------------------------------------------------------

    /**
     * Save
     *
     * @param 	string		unique identifier
     * @param 	mixed		data being cached
     * @param 	int			time to live
     * @return 	boolean 	true on success, false on failure
     */
    public function save($id, $data, $ttl = 60)
    {
        if (get_class($this->_memcached) == 'Memcached')
        {
            return $this->_memcached->set($id, array($data, time(), $ttl), $ttl);
        }
        else if (get_class($this->_memcached) == 'Memcache')
        {
            return $this->_memcached->set($id, array($data, time(), $ttl), 0, $ttl);
        }

        return FALSE;
    }

    // ------------------------------------------------------------------------

    /**
     * Delete from Cache
     *
     * @param 	mixed		key to be deleted.
     * @return 	boolean 	true on success, false on failure
     */
    public function delete($id)
    {
        return $this->_memcached->delete($id);
    }

    // ------------------------------------------------------------------------

    /**
     * Clean the Cache
     *
     * @return 	boolean		false on failure/true on success
     */
    public function clean()
    {
        return $this->_memcached->flush();
    }

    // ------------------------------------------------------------------------

    /**
     * Cache Info
     *
     * @param 	null		type not supported in memcached
     * @return 	mixed 		array on success, false on failure
     */
    public function cache_info($type = NULL)
    {
        return $this->_memcached->getStats();
    }

    // ------------------------------------------------------------------------

    /**
     * Get Cache Metadata
     *
     * @param 	mixed		key to get cache metadata on
     * @return 	mixed		FALSE on failure, array on success.
     */
    public function get_metadata($id)
    {
        $stored = $this->_memcached->get($id);

        if (count($stored) !== 3)
        {
            return FALSE;
        }

        list($data, $time, $ttl) = $stored;

        return array(
            'expire'	=> $time + $ttl,
            'mtime'		=> $time,
            'data'		=> $data
        );
    }

    // ------------------------------------------------------------------------

    /**
     * Setup memcached.
     */
    private function _setup_memcached()
    {
        // Try to load memcached server info from the config file.
        $CI =& get_instance();
        if ($CI->config->load('memcached', TRUE, TRUE))
        {
            if (is_array($CI->config->config['memcached']))
            {
                $this->_memcache_conf = NULL;

                foreach ($CI->config->config['memcached'] as $name => $conf)
                {
                    $this->_memcache_conf[$name] = $conf;
                }
            }
        }

        if(class_exists("Memcached")){
            $this->_memcached = new Memcached();
        }else{
            $this->_memcached = new Memcache();
        }


        foreach ($this->_memcache_conf as $name => $cache_server)
        {
            if ( ! array_key_exists('hostname', $cache_server))
            {
                $cache_server['hostname'] = $this->_default_options['default_host'];
            }

            if ( ! array_key_exists('port', $cache_server))
            {
                $cache_server['port'] = $this->_default_options['default_port'];
            }

            if ( ! array_key_exists('weight', $cache_server))
            {
                $cache_server['weight'] = $this->_default_options['default_weight'];
            }

            $this->_memcached->addServer(
                $cache_server['hostname'], $cache_server['port'], $cache_server['weight']
            );
        }
    }

    // ------------------------------------------------------------------------

// aaaaaaaaaaaaaaaaaaaaaaaa
    /**
     * Is supported
     *
     * Returns FALSE if memcached is not supported on the system.
     * If it is, we setup the memcached object & return TRUE
     */
    public function is_supported()
    {
        if ( !extension_loaded('memcached') && !extension_loaded('memcache'))
        {
            log_message('error', 'The Memcached Extension must be loaded to use Memcached Cache.');

            return FALSE;
        }

        $this->_setup_memcached();
        return TRUE;
    }

    // ------------------------------------------------------------------------

}
// End Class

/* End of file Cache_memcached.php */
/* Location: ./system/libraries/Cache/drivers/Cache_memcached.php */